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Reply to "Sewage pumps premature failure"

Please clarify your problem, is it a pipe cracking or pump performance or winding failure? Need the exact model of pump to identify proper pump performance. Is system 3 years old before failures? There are no hand valves, T's 90's 45's in the system?

What is the flow rate you are trying to obtain? You need to be as close to the performance line as possible If the 11' is too far left of the curve the pump can cavitate cause vibration and crack pipe or fail winding. 

It sounds like to me.....a possible system issue. There is typically a big difference in pump output from 1 1/4 to 2 1/2/3" pumps. The size of your discharge pipe is so big it offers very little "system" back pressure so you are working with primarily vertical rise.

Place a valve in the discharge of the pump somewhere and crack the valve open slightly, start the pump. The valve will be the "false head" needed to put back pressure on the pump and move the water, need curve to verify my explaination

Dave

RM
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